Walchem WebMaster Manuel d'instructions télécharger pdf (Page 47)

pH Set Points

Set Point xx.xx

Use the arrow keys to change the pH value at which the pump will turn on in order to correct it.

Any value between –2 and 16 is acceptable (if based on direct pH sensor). If the control mode is

based on a 4-20 mA input, then the set point value is limited to the range of the 4-20 mA input.

Press Enter to accept the new value.

Dead Band xx.xx

Use the arrow keys to change the pH value away from the set point at which the pump will stop

running. For example, if you are forcing the pH lower, your set point is 8.00, and your dead band

is 0.05, then the acid pump will start at 8.01 pH and stop at 7.95 pH. The purpose of the dead band

is to prevent rapid cycling of the relay open and closed, which can shorten its life. The dead band

should be set for the lowest value that still prevents the relay from chattering. Press Enter to accept

the new value.

Output Time Lim xxxx

Use the arrow keys to change the maximum amount of time that the pH pump can be continuously

running before the controller shuts off the pump and activates an Output Time Limit alarm. This is

intended to prevent the pump from emptying an entire drum of chemical because of a problem

somewhere in the system. Press Enter to accept the new value.

Note that the pump will not run again until someone resets the timer! The time limit should be set

at approximately twice the normal worst case on time.

Hand Time Limit xxxx

Use the arrow keys to change the maximum number of minutes that the pH output can be activated

in the Hand mode. Any value between 0 and 1440 is acceptable. A value of 0 means the output can

be left on indefinitely. Press Enter to accept the new value.

ORP Set Points

Set Point xxxx

Use the arrow keys to change the ORP value at which the relay will close (to start a pump, or open

a solenoid valve) in order to correct it. Any value between –1500 and 1500 is acceptable (if based

on direct ORP sensor). If the control mode is based on a 4-20 mA input, then the set point value is

limited to the range of the 4-20 mA input. Press Enter to accept the new value.

Dead Band xxxx

Use the arrow keys to change the ORP value away from the set point at which the pump will stop

running. For example, if you are forcing the ORP higher, your set point is 400 mV, and your dead

band is 10 mV, then the hypochlorite pump will start at 399 mV and stop at 405 mV. The purpose

of the dead band is to prevent rapid cycling of the relay open and closed, which can shorten its life.

The dead band should be set for the lowest value that still prevents the relay from chattering. Press

Enter to accept the new value.

Output Time Lim xxxx

Use the arrow keys to change the maximum amount of time that the ORP pump can be

continuously running before the controller shuts off the pump and activates an Output Time Limit

alarm. This is intended to prevent the pump from emptying an entire drum of chemical because of

a problem somewhere in the system.

Note that the pump will not run again until someone resets the timer! The time limit should be set

at approximately twice the normal worst case on time.

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Walchem WebMaster Manuel d'instructions Page 47

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